codecs/a52.h

   1 /*****************************************************************************
   2  * a52.h:
   3  *****************************************************************************
   4  * Copyright (C) 2012-2015 L-SMASH project
   5  *
   6  * Authors: Yusuke Nakamura <muken.the.vfrmaniac@gmail.com>
   7  *
   8  * Permission to use, copy, modify, and/or distribute this software for any
   9  * purpose with or without fee is hereby granted, provided that the above
  10  * copyright notice and this permission notice appear in all copies.
  11  *
  12  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  13  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  14  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  15  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  16  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  17  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  18  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  19  *****************************************************************************/
  20
  21 /* This file is available under an ISC license. */
  22
  23 #define AC3_MIN_SYNCFRAME_LENGTH  128
  24 #define AC3_MAX_SYNCFRAME_LENGTH  3840
  25 #define EAC3_MAX_SYNCFRAME_LENGTH 4096
  26
  27 typedef struct
  28 {
  29     lsmash_ac3_specific_parameters_t dac3_param;
  30     lsmash_bits_t *bits;
  31 } ac3_info_t;
  32
  33 typedef struct
  34 {
  35     lsmash_eac3_specific_parameters_t dec3_param;
  36     lsmash_eac3_substream_info_t independent_info[8];
  37     lsmash_eac3_substream_info_t dependent_info;
  38     uint8_t  dec3_param_initialized;
  39     uint8_t  strmtyp;
  40     uint8_t  substreamid;
  41     uint8_t  current_independent_substream_id;
  42     uint8_t  fscod2;
  43     uint8_t  numblkscod;
  44     uint8_t  number_of_audio_blocks;
  45     uint8_t  number_of_independent_substreams;
  46     uint32_t syncframe_count;
  47     uint32_t frame_size;
  48     lsmash_bits_t *bits;
  49 } eac3_info_t;
  50
  51 extern const uint32_t ac3_sample_rate_table  [4];
  52 extern const uint32_t ac3_channel_count_table[8];
  53 extern const uint8_t eac3_audio_block_table  [4];
  54
  55 static inline uint32_t ac3_get_channel_count
  56 (
  57     lsmash_ac3_specific_parameters_t *dac3_param
  58 )
  59 {
  60     return ac3_channel_count_table[ dac3_param->acmod ] + dac3_param->lfeon;
  61 }
  62
  63 uint32_t ac3_get_sample_rate
  64 (
  65     lsmash_ac3_specific_parameters_t *dac3_param
  66 );
  67
  68 int ac3_parse_syncframe_header
  69 (
  70     ac3_info_t *info
  71 );
  72
  73 int eac3_parse_syncframe
  74 (
  75     eac3_info_t *info
  76 );
  77
  78 void eac3_update_specific_param
  79 (
  80     eac3_info_t *info
  81 );
  82
  83 void eac3_update_sample_rate
  84 (
  85     uint32_t                          *frequency,
  86     lsmash_eac3_specific_parameters_t *dec3_param,
  87     uint8_t                           *fscod2
  88 );
  89
  90 void eac3_update_channel_count
  91 (
  92     uint32_t                          *channels,
  93     lsmash_eac3_specific_parameters_t *dec3_param
  94 );